Ok, thank you guys for your replies!
Since mining with a mac means ultimately destroying it it doesn't seem to be such a good idea any more.
ASIC USB Miners...well if you could get them for 20-35 USD that could be interesting
but getting them for 100+ Euro as currently seems to be the regular price in EU I don't really see the point other than having a new toy with the BTC logo on it.
So I guess no btc lottery tickets for me and my mac.
Maybe one day another new generation of mining hardware will come along and we who missed the ASIC train will have chance to hop on then.
Thanks again!
Take care!